Tyga's Happy for Blac Chyna & Rob ... And Not Afraid to Say It

Tyga just broke ranks with Kylie Jenner and the fam ... by speaking out, and giving Rob Kardashian and baby mama Blac Chyna props on their engagement.

Tyga says, "It makes me happy to see the mother of my son happy. My only concern in this situation is my son." Kylie's BF is the first person even remotely close to Kris Jenner or her daughters to say a word about Rob and Chyna's big news.

Tyga -- who took off for Vail with the rest of the family on Monday -- added, "Everybody deserves 2 be happy."